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Video cone

Lankelma’s video cone penetrometer with a recording camera element allows both us and our clients to get a closer look at the geology. Sitting behind a sapphire window with adjustable LED lighting, this technology permits a clear view of the immediate material. With a penetration rate of 0.5 cm/s using the standard CPT equipment, the progress is viewed live, and recorded, via an external monitor on the CPT truck.

The image allows particles such as shells and sand grains to be distinguished easily, and small voids and gas bubbles can be identified. The recording software is being upgraded to include a graticule enabling grain size comparison on screen.

When used in combination with other CPT techniques, the video cone results can provide additional data to help build a ground model and better understand the ground.

The video cone has applications for soil contamination as a reliable technique to identify and aid the mapping of contamination layers, and with the identification of chalk by providing a clear image of the boundary between cohesive soils and chalk.